Dont get me wrong guys. Im not saying that a cell phone can or will cause a crash. The testing I linked was done using synthesized transmitters but it was done under controlled conditions.

Cell phones do emit quite a bit of RF engery before they ring. Need proof? Mine will drown out the radio in my car with buzzing before it rings. The new one isn't as bad, my old Nextel I thought was going to blow a speaker.

But what I am saying is don't dismiss it out of hand. Like Fastsky says, it could be a harmonic. TV stations aren't on or near our freqencies either but harmonics from them have made certain channels in certain area's useless.

All that being said, most radio problems that get blamed on "getting hit" are usually caused by poor installation or older equipment or mixing and matching crystals trying to save 3 bucks. Nearly all of which could be prevented by proper installation and proper maintence.